Hydrobiologia

, Volume 744, Issue 1, pp 223–233 | Cite as

The impact of introduced pike (Esox lucius L.) on allopatric brown trout (Salmo trutta L.) in a small stream

  • Trygve Hesthagen
  • Odd T. Sandlund
  • Anders G. Finstad
  • Bjørn O. Johnsen
Primary Research Paper

Abstract

The abundance and size-structure of a formerly allopatric brown trout (Salmo trutta L.) population in an inlet stream to a small lake were monitored for 9 years (1987–1995) after the first observation of introduced pike (Esox lucius L.), and revisited 18 years later (2013). All age groups of brown trout were reduced after the pike introduction, especially older fish of age-≥2+, but less so for age-0+ and 1+ fish. We suggest that the decline of older brown trout is mainly due to the high predation pressure from pike when migrating into the adjacent lake to feed. Young stream-dwelling pike of age-0+ and 1+ which ranged between 6 and 27 cm in length may also exert a predation pressure on juvenile brown trout that remains in the stream.

Keywords

Stream Brown trout Pike predation Density Population structure 

Notes

Acknowledgments

This study was financed by Norwegian Institute for Nature Research. We thank our colleague Ola Ugedal and two anonymous referees for valuable comments on this paper.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Trygve Hesthagen
    • 1
  • Odd T. Sandlund
    • 1
  • Anders G. Finstad
    • 1
  • Bjørn O. Johnsen
    • 1
  1. 1.Norwegian Institute for Nature ResearchTrondheimNorway

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